Australian Open dark horse Grigor Dimitrov is the first man through to the second round at Melbourne Park.
Dimitrov, seeded 11th, made light work of Dustin Brown, breaking the German five times to advance 6-2 6-3 6-2 in just 67 minutes on Monday.
The 2014 Wimbledon semi-finalist will next play Argentine Maximo Gonzalez or Slovakian Lukas Lacko on Wednesday for a spot in the third round.
